资 源 简 介
calculate the sum of give data. ex. give 5, result = 1+2+3+ .. +5 = 10. given 100, result = 1+2+3+...+100=5050
the calc process is put to a low priority thread.
Start button will start a calculation.
Stop button will stop a calculation, and wait for its stop using Thread.join()
wrong format data is inputed, Thoad message will show.
